The map

The map is a paper map found among Chandra Suresh's research, depicting the entire Earth and filled with push-pins in different locations with strings connecting each of them. The map presumably documents the locations of identified evolved humans.

Chandra Suresh pins a photo of Nathan Petrelli on his map as Gabriel Gray arrives at Chandra's apartment for the first time. Later, when Mr. Bennet arrives, he looks at the high school picture of Claire on the map. Surrounding the picture of Claire are photos of Matt, Niki, Charlie, and Nathan.

Once Sylar and Mohinder return to New York, Mohinder discusses Chandra's research, including the map. When Mohinder shows the stress of driving, Sylar (impersonating Zane) selects Isaac's Post-it note from the map and attempts to call him.

Later, when Mohinder is interrogating Sylar, Sylar mentions that he used Chandra's map to find evolved humans.

When Noah is younger, he makes a map of specials and how they connect.

Trivia

According to Sendhil Ramamurthy in the video commentary of Godsend, "If we had a close up, most of the people on the pictures on the map are actually crew members." This part of the commentary is during "Godsend Part Two", during the conversation between the FBI Agent and Mohinder.